Used primarily as an intermediate in the synthesis of pharmaceutical compounds, particularly in the development of kinase inhibitors for cancer treatment. Its structure allows for selective modification, making it valuable in creating targeted therapies. It is also employed in research settings to develop new bioactive molecules with potential antitumor and antimicrobial properties. Due to the presence of reactive halogen groups, it facilitates coupling reactions in medicinal chemistry, enabling the construction of complex quinazoline-based derivatives.